At the start of the pandemic, health departments across the country put a big emphasis on the COVID-19 mitigation method. Leaders have said it's still happening.

Surrey, B.C., school teacher Ruby Stovern learned on Nov. 8 that her 16-year-old son tested positive for COVID-19. What happened next – or, more importantly, what didn’t happen ...

Rather than working out who someone with Covid-19 may have infected, a backward tracing programme tries to identify where a coronavirus patient contracted the virus in the first place.